Boring-bar.



W. A. SCHROEDER & A. J. NOLTB.

BORING BAR. Y

APPLICATION FILED JUNE 19, 1911.

1,043.874, Patented N0v.12,1912. Fl. g-J- NVENTORS.'

A TTO/BNEYS.

Unir-nn PATENT orar WrLLrAM A.- soHnoEnnRANnALBERT .'rfiiionrnv or-s'n Lotus. Mrssu Application filed June 1a,

justable device and one'u'hich is capable of ea'sv combination ivith other special. tools' without removal from the lathe or other operating machine.,and.l also, the provision of a tool in which the degree of expansion of the cutters may be so exactly ascertained that a given pluralit)7 of borings may be of precisely the same diameter.

Another object is to secure a greater degree'of expansion for the cutters than has been afforded heretofore.

'Further objects and advantages will be apparent in a reading of the following description and are particularly pointed out in the claims. A

The desiderata mentioned and referred to we attain b v the construction and arrangement of parts shoivn in the accompanying drawing, in which like numerals and let ters` refer to lilte parts throughout the several vieivs, Figure 1 being" an elevation of the complete tool; Figt 2 avcombined longi tudinal sectionA and elevation showing the interior arrangement, the cutters not being expanded; Fig. 3 a detail view of the cutteradjusting head andthe means bywhieh it is moved; and Figs. l and 5 internal and sion cutters. l

In Icarrying our invention into practice We provide a barrel 1 comprising a body portion 2, a shoulder 3, a shank 4 ending in threads 5, an interior guideway 6 terminating in threads 7, cutter-slots 8, and a special tool slot 9. Thus the mechanic is enabled to,l

Bonino-BAR. c

Specification' of Letters Patenti'.

1911. Serial NO. 634.075.

"ivelv small pro iertions..

,and indents or ,)otdtet` 1Slv external surfaces, respectively, of the expana-micrometer scale 12?. n x in vconnectitm with .an inde. Y an annular stationary member 13 l eral parts being clamped .togetlie @ning` a suitablebar Hupe' tl i ters l5 are vef a 'formv i na ;imum `e.\;pansioi 1 cuttiugedge lo. a pli ali rserving to accommodatef cutters are opposer. nin as sheu'n in. Fig. L. lll disposed a cutter-adpl Ly I same .comprising forked ,n'iemb at intervals bv .vedgeshaped dev i an aperturcd extreii'utif' 'Ltpertuie registers with av similar larger aperture :32E disposed through shank 4 of barrel l, and through said apertures is projected a half bolt 24 Whose threads cooperate ivith threads upon the inner face of adjusting-collar lf2 to move member 1S) in said guideway, as best shown in FiO'-, 3. That the certain adjustment of cutters 15 be'not disturbed when. for any reason. the tool is separated from bar 1%, .ve provide a countersunkset-screw Q5 b v which collar 10' may be held against movement, While immber 13 is prevented from rotation by a removable pin 2G which .tits within a groove provided in the inner face of said member. i,

It will be noted that locking-ring' 1i is rather loosely mounted upon shank 4 and that its upper edge gradually slopes upward on either side from a point above slots 111. B v these devices We insure that key 10 will be posit'ivelvv forced against both of the expansion'cutters even though one thereof become shorter than the other. for in the lat-ter event the tightening of collar12 will cause said rin-g;` to incline or tilt toward the shorter cutter and so bring said key into engage ment therewith.

In operation cutters 15 are inserted in opposite slots Svfjnd' the upper portion of inclines "T brow it to `bear against `Wedgeshaped4 tit-rire as shown in Fig. Q, the lon-er portiffn of -said inclines beine' received within poel 1S. The base of devices 21 corresponding; in depth to the diameter of cutter-adju. l head "9 and each of inclines 1?'. 5 a depth equal to that f said base-.rit follows that upon continued rotation in one direction of collar 12 each of cutters 15 may simultaneouslv prol cure by Uetters-Patent is I", V1. A boringbar comprising a plurality 'of cutters, a'cutter-expanding member, a

A mounted upon the shank ofsaidbai', and a What We claim as new and desire and said collar adapted to engage said edge lof said ring.

' 'Q YA' boring bar comprising a plurality vof cutters, .a cutter-expanding member, a

jected to an extent equal to the diameter of member 19.

to seoollar lnovably engaging said member -for the ad]ust1n'ent. of said cutters, a ring loosely `key normally disposed' between said cutters and r1ng, sa1d ring having an lnclined edge,'

collar' movably engaging said member for the adjustment of said cutters, a ring loosely 1 mounted upon the shank of said bar, a ke'yf'i normally disposed. between said euttersand l ring. and devices whereby each ofwsaid out' the diameter 'of said member, said ring haY- i ing an inclined edge, and said collar` adapted to engage said edge of said rmg.`

, 3. A boring bar comprising a 'plurality of cutters, a cutter-expandng member, a

micrometrically-scaled collar movably engaging said member for 4the certain adjust? ment of said cutters, a ring loosely mounted upon the. shank of said bar, and a key normally disposed between said cutters and rlng, said rin having an inclined edge, and

said collar ac apted to engage said edge' of expanded to an extent equal to the diameter of said member, .said ring havingan inclinedl edge, and said4 collar adapted to l g engage said edge of said ring. I 'ters-may be expanded to an extent equal :to I

WM. A. sCHRoEDER.. ALBERT J. NoLTE.

)Vitnesses FRED SCHLUETER, FRED J. BaRroR'r. 

